MySQL 查詢以獲取多個最小值?
為此,您可以使用子查詢和 MIN()。讓我們首先建立一個表−
mysql> create table DemoTable -> ( -> Name varchar(20), -> Score int -> ); Query OK, 0 rows affected (0.56 sec)
使用 insert 命令在表中插入一些記錄−
mysql> insert into DemoTable values('John',56); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values('John',45); Query OK, 1 row affected (0.24 sec) mysql> insert into DemoTable values('John',58); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values('Chris',43); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('Chris',38); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('Chris',87); Query OK, 1 row affected (0.14 sec)
使用 select 語句顯示錶中的所有記錄−
mysql> select *from DemoTable;
這將產生以下輸出−
+-------+-------+ | Name | Score | +-------+-------+ | John | 56 | | John | 45 | | John | 58 | | Chris | 43 | | Chris | 38 | | Chris | 87 | +-------+-------+ 6 rows in set (0.00 sec)
以下是獲取多個最小值查詢−
mysql> select *from DemoTable tbl1 -> where Score IN( select min(Score) from DemoTable tbl2 where tbl1.Name=tbl2.Name);
這將產生以下輸出−
+-------+-------+ | Name | Score | +-------+-------+ | John | 45 | | Chris | 38 | +-------+-------+ 2 rows in set (0.00 sec)
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